Driving of single-phase motors.



UN'ITED STATES PATENT OFFICE.

KARL SCHNE'IZLER, OF BADEN, SWITZERLAND, ASSIGNOB. T0 AKTIENGESELLSCHAFT BROWN, BO'VERI & CIE. OF BADEN, SWIIZ'ERLAND.

DRIVING OF SINGLE-PHASE MOTORS.

. Specifisacion of Letters Patent.

Pate1it@d Ain. 22,1913.

Application filed March 19, 1910. Serial N0. 550,361.

T0 all w/wm z'zf may concern Be it known'that I, KARL SCHNE'IZLER, 21 subjec't of the Emperor 0f Germnny, resid- 1ng at Burghaldenstrasse 951, Baden, Swit- Zerland, have invented Certain .pew und useful Improvements in anal Relating to the Driving 0f Single-Phase Motors, 0f which the following is a specificaf'ion.

This invention relates to the driving of single-phase motors' anal n1ore particularly to a method of driving, of the general character of that Set forth in applicution for Letters Patent N0. 543,348, fi1ed 0n the 2nd day of November, 1910, in which an arrangen1ent is described which makes it possible to at= tach two single-phase motors which am oft the snme size and which 2ue coupled together t0 a three-phage current nehvork, without the aid of a transformer, in such a manner thut the phases of the three-phase current network are equally loaded. ment is such that the singlephase motors are driven from polyphase mnins by taking current fr01n Part 0f 1he phases to driven one motor and current from The other part of fhe phases. to drive ihe othor the two m0- t01s beinp; suitab1y connected mechanically.

The 'olfage f01 which lhe stator windings of the. two components of the m1angement mustbe designed, are in ihe ratio 01. 1:0.8T, and The case may axise, especially if the voltag'e 0f the network is 10W and Ehe power of the 1notor high thnt the given voltages leud (0 inconvenient nnmbers of bars 01 slots f01' one 01 thc othg3r stator, if the c0ndition nf equnlity is t0 be nminfained. This may be rumedied by altering the voltago f0l' a slight nmount.

The object uf the p1'c9cnt inwntion is 10 nbtain a method oi 4h'iVing by :1Hvring ihn voltage 215 rcfel'xcd t0 nbnvv.

The invention consisi s in an inn rove(l zumngernent f0r the driving 0f singlo-phasc -nmtors 13'1'01n p0lyphnsc nmins in which 0ne 0f the stntors is dircctly nttuched 10 the netwhile thc 01'110! obinins a snih1bly vancd voltnge by meuns 0f n tmnsfornwr such ns an ant0-tmnsformer.

Referring n0w t0 the nccompnnying dingrnrnmutic drawings which S'hOW The inventi0n applicd in 0nv. mnnnnr 10 tw0 singluphasu nwiors, onu 0f which (a) is excifod frmn two-phases of n throe-phuse nvtwork, andth0 01'h01 lmm one phase,

Figurc 1 shows an m;rnngrnnnl in which The arrzmgethe snit able altemtion of voltage i's effected In (Ir1v1ng the mofo1 a, und Fig. 2 an 211'- rangement where it is eflected in driving the main 3 at the terminu'l III und t0 the junction 0f the windings e and f.

Referring now to F ig. 2 of the'drawings, the motors remnin as before. bnt in this case themotor a is ei cited by Winding h and z, c0nl1ected to the necwork withont transformers at the terminals I and II, und the mot0r b is excited bythe windixig (Z through an auto-tmnsfonner connected Wifl1 be network at the terminnl III and with the windings h und z zitthgir common point.

It Will be understood that the ratio 0 f transformation in each case where Hans-- forme1s are used 1s achusted to the proper amount fo1 proper proportioning of the exciting Windingrs consistent with conv'enient arrangement 0f them.

Having nowdestzribed my invention whzit I c1aim as new und desire to secure by Letters Patent is l. In dynamo electri machinery in c0mbinati0n tWo single phase alternating eurrent motors including stn.tors and rotors, nlternating current polyphase mains windi ngs on Sa'id stators, clectrical connections from (110 winding on one stntor to'part 0f tlxe nmins, an elec trica] conncction from the winding 011 the other statnr in part t0 nther. of the nnu'ns together with an eYectricn] conncction between the two windings, n voltage changing device a1sp being included in the connection betvveen one'sty1tor und the mziins; as set forth.

2. In dynanno elcctric mnchinery in combinntion tw0 single phnsc nlternating cmfent motors incl'nding sfators and rotors, ulternating cnrrcnt polyphase mains, windings 011 snid stntors. electrival connections frmn 0110 m sui(l winrlings t0 part 0f the mains und fr nn The ofhe1 of said windings in part to 0thvr of the. mnins together with an auto-transformer connkacted between 0ne of said Winding5 zmd 0ne 0f said mains and an electrical connection fr0m the auto transformer to the other 015 the windings; as set forth.

3. In combination two single phase dynamo electric motors including stators and rotors; altervating current three-phase mains, an auto ransformer, elecirical connectins from one stator t0 said mains through pul't of said'transformer Winding and from i:he

nher stator t0 said mains throngh the in* termediary of said transformer; as set forth.

4:. In dynamo electric machinery in com binzition two electrical rotors, a meclmnicnl connection between said rotors, an elecfrica] winding dis posed in proximity t0 one of said rotors and 21 second Winding disposed in proximity to t-he other of said rotors, alternating current three-phase mains, a furthe:r electncai winding, a connection from 0ne 0f said mains t0 one end 0f' said further electrical wining and from a second of said mains 1 0 the other end of said winding, an electrical connection fr0m the windixig disposed in p1'oximity t0 the fi1st rotor 10 0110 p(iint in said further electrical Winding c0nnected to the mains and an electrical connec tion from the other end of said first winding to another point in ehe winding connected w the mains together With an electrical C011- nection from a point in said further e1ectrica.l Winding to the winding dsp0sed in proximity t0 the second r0t0r anci a further electrical connection from the (ber end of that winding to the third main; aS sei; forth.

In dynamo eiectric machinery in combination two Single phase dynamo electric rn0tnrs -inc]uding stators and rotors, alternating' current, 3 phase nmins und an autoh'mlsformer, winding's 011 said stators, dect1ica1 ccnnections behveen wie 0f said Windings and sairl mains, in partthrough the infmmedial'y 0f mm part 0f fl1e transformer und electricnl conncciions between the other Wi nding :md the other part 0-f said trans- 'fOI'IDEI; 21g seil f0rth.

6. In combination two sing1e phase dynarnc electric motors including stators and 1otors, alternnting current three phnse mains, an z1uto transformer, a piumlity 0f' electrical connections between one 0f said stator Windings and the said mains through fhe intermediary 0-f said auto transformer zmd further elect-rical connections between the other stator w:y]nding and a portion 0f the zu1t0 transformr Winding; ns set fm'fh.

In testimony Whereof, I afiix my signatm:e in presenca of two witnesses.

KARL SCHNETZLEP.

Witnesses:

ALBERT iJCHEL-E, CURT HOENIG. 

